Base Set 2 Grass Energy 127/130: PSA 9 vs PSA 10
Base Set 2 Grass Energy 127/130 shows an unusually wide gem-mint premium between PSA 9 and PSA 10: a $43 dollar gap, with the gem mint multiplier at 6.7x. Based on the last tracked PSA 10 sale of $50.00 on Feb 16, 2021, the math leans toward holding the 9: expected value turns negative at conservative upgrade probabilities once the resub fee is in.
PSA 10
$50.00
Last sale $50.00 on
PSA 9
$7.50
Last sale $7.50 on
PSA 8
$9.50
Last sale $7.50 on
The Spread
The PSA 9 to PSA 10 spread on Grass Energy 127/130 (Base Set 2).
$43
Dollar gap, PSA 9 to PSA 10
6.7x
PSA 10 sells for 6.7x a PSA 9
Three-Outcome EV Calculator
15%
70%
15%
Defaults are conservative starting points. Adjust based on the specific slab. A borderline 9 with strong centering plays differently than a 9 with edge wear.
PSA 10 outcome (sale price minus resub minus acquisition)
$0
PSA 9 outcome (regrade, no upgrade)
$0
PSA 8 outcome (downgrade, slower sell, tied capital)
$0
Expected Value
$0
Math favors holding the 9
Where this card lands in the broader Base Set 2 picture: a WOTC-era card carrying a $43 gap between PSA 9 and PSA 10, a 6.7x multiple on the PSA 9 price.
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